Permavent MAX ALL ZONES is a vapour-permeable membrane designed for use as a secondary barrier in pitched roof and wall constructions. The membrane is suitable for installation across all roof exposure zones in accordance with BS 5534:2014 +A2:2018, providing flexibility in design and installation.
The membrane has been BRE tested and approved for unrestricted use within the UK, including installations with battened or taped laps at gauges of ≤345 mm, when installed in accordance with certification requirements. It may be installed in unsupported or fully supported applications, allowing suitability across a wide range of roofing and wall build-ups.
Permavent MAX ALL ZONES achieves a W1 water resistance classification and provides a hydrostatic head greater than 2.0 metres, indicating resistance to water penetration under pressure, including wind-driven rain.
The membrane is available with an optional integrated tape system, enabling sealed laps to support airtightness, improve installation efficiency, and reduce on-site material waste.

• Vapour-permeable membrane for roof and wall constructions
• Suitable for use with all types of solar panels
• Suitable for use in all wind exposure zones, independent of installation method, when installed in accordance with fitting guidance
• BBA certified 22/6247
• GRAPHITE meets BS 5534:2014+A2:2018. Slating and tiling for pitched roofs and vertical cladding. Code of practice
• W1 water resistance rating for external moisture protection
• High tensile strength to withstand installation stresses and wind loading
• High tear resistance, supporting integrity around fixings and penetrations
• Available in 1m x 50m, 1.5m x 50m rolls and 1mx50m (taped)